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How much power needed to drive 91db speakers?

Sonus Farber lists the sensitivity of my speakers at 91 db SPL@ 1 meter @4 ohms.  They also say I should use  50-450 watts of power. My PS Audio amps pump out 500 watts @4ohms, so the max isn’t a problem, but if I switched to something 15-50 class A watts, would that be more than enough power?  
 

Thanks in advance.

curiousjim
ghdprentice
8,110 posts
 

ARC Ref 80S + Sonus Faber is an excellent match. 

kofibaffour
460 posts
 

@curiousjim like I said you don't need a new amp but if you wanna dabble regardless that's your decision. Have fun :)

curiousjim's avatar
curiousjim OP
5,372 posts
 

@ghdprentice 

George,  I knew when I mentioned the Ref 80s that you’d chime in.😁

Do you have an older Amati model?  The G5 ( which I have) is 91 db, so that makes me agree with you even more about 70 watts being more than enough.  
Now to start working on the wife.

 Wish me luck.🤞🏻🤞🏻

ghdprentice
8,110 posts
 

Older ones. 
 

Buy your wife a really extravagant, heart felt gift before casually mentioning it. Mention in the afterglow. 

ericba's avatar
ericba
75 posts
 

Agree with @ghdprentice . My Pass XA25 pure class A can drive my 91 db Dynaudio at 4 ohms.  Room size will be a factor to consider however. Mine is 10x 19 . 

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